Re: is JF-17/FC-1 good enough? why doesn't China supply J-10 to Pakistan instead?
India could do the same selling weapons to Taiwan or Vietnam
What does India have to offer Taiwan or Vietnam that would make much of a difference at all in the strategic context?
India doesn't even have LCAs in their own air force, the plane, like every other major weapon system India has developed 'indiginously' is so full of foreign parts, it will probably take longer for the lawyers to get export authorisation from all interested parties as it would take to build the jets themselves. If even a single foreign supplier says 'no' to selling arms to Taiwan, that's probably years more of delays and budget over runs to find a replacement part.
Even if they managed to somehow deliver actual examples, the LCA is at best on a similar level to Taiwan's existing M2Ks or F16s, and certainly no match against th latest F16s Taiwan want from the US, or the J10A.
That's just the problems India would face in trying to deliver weapons. In reality, any such move by India will draw a powerful response from China.
Shifting some of the ballistic missiles currently deployed near Taiwan to Tibet as well as some modern fighters or even 1st teer ground forces would force the Indians to respond likewise and will tie a significant portion of their forces down in the west. That will weaken India's deployment against Pakistan, or force them to have to increase the number of men and machines in their military to compensate.
China could sign a mutual defense pack with Pakistan that will realise India's worst nightmare of a war on two fronts if they make a move against Pakistan.
If China wants to be less confrontational, they can introduce a similar military aid programme to Pakistan as the US has.
Its not secret the PAF would dearly love to have J10s, but cannot afford them on top of all the over things they are buying. China could gift them a few regiments if they wanted to. Maybe also throw in some HQ9s in there as well.
In short, it is highly questionable what weapons India could actually provide Taiwan or Vietnam even if they wanted to. Even if they somehow managed to deliver those weapons, they will make only a limited impact as nothing India can make is as advanced or capable as what the PLA already has operationally deployed, and by the time the Indians deliver export weapons, if their past performance is any indication, the experimental/prototype stage weapons we are seeing today in China will probably be operational. At best, selling weapons to Taiwan will anger China.
OTOH, China can easily do things that will massively screw with India's national security to the point of potentially changing the whole strategic balanace in South Asia.
China's current main strategic and military focus is towards the East. It would be an incredible stupid move for India to do something so provocative as to give Beijing real cause to change that focus on them.